Этот фильтр расширяет и усиливает светлые места текущего слоя или выделения.

For every image pixel, it brings the pixel Value (luminosity) into line with the upper value (the brightest) of the 8 neighboring pixels (3×3 matrix). So, a bright pixel is added around bright areas. An isolated pixel on a brighter background will be deleted. A larger bright area will dilate by one pixel in all directions.

On complex images, bright areas are widened and enhanced the same, and somewhat pixelated.

На сплошном фоне этот фильтр может удалить шум:

This filter is found in the main menu under Filters → Generic → Dilate.